Leading-in device for metallic vacuum-discharge containers



March 14, 1933.

w. DILENBACH 1,901,802

LEADING-IN DEVICE FOR METALLIC VACUUM DISCHARGE CONTAINERS Filed March 18. 1929 Patented Mar. 14, 1933 AUNITEDys'mresA PATENT OFFICE WALTER DLLENBACH, oFpZUaIcrr. SWITZERLAND LEADING-IN DEVICE FOR METALLIC YACUUM-DISCHARGE CONTAINERS 'Application led Kai-ch 18, 1929, Serial No. 347,965, and in Germany 'Api-112, 1928.

This invention relates to leading in devices for metallic vacuum-discharge containers of the kind wherein the metal parts that are situated in vacua, and influence the electric field in the neighbourhood of the insulatorV of leading-in device of the kind described' wherein the said metal parts are held in their position in an improved manner.

According to the invention there is provided a leading-in device of the kind described (for example according to my above mentioned application, Ser. No. 170,505) for a metallic vacuum-discharge container, wherein the metallic parts that are situated in vacua, and influence the electric field in the neighbourhood of the insulator sealing the vacuum, are held fast in their position 'at .30 least in part by soldering, brazing, or welding, for example spot-welding, or like securing means.

In the case of a vacuum-sealing insulator this mode of attachment is of particular im- 35 portance when the insulator consists of a glass tube fused to two metal tubes. When the two metal tubes are machined exactly they may nevertheless change their shape slightlyor warp somewhat during the fusing operation. 40 Further, it is not possible for a glass-blower toput two metal tubes connected by the glass tube in such an exactly coaxial position relatively7 to one another as can be done with machined metal parts fitting one on another. It is much easier to avoid such irregularities when the metal parts inluencingthe field are erected by means of welding orsoldering at plkaces instead of using rivets, screws Aor the 1 e.

The metal partsv influencing the eld will, at least in part, be fixed rigidlyrelatively to the two metal tubes adjoining the vacuumsealing insulator. As these two tubes, in general, are not positioned `suflicientlyexactly ,coaxially relatively to one another, .aocording to another feature of the invention the metal parts are` at 'least' in part arranged coaxial to anaxis that is cent-ra relatively tothe two ymetal tubes. v

' The devicemay be constructed as follows The parts to be assembled together'with the glass-metal assembly, such as the electrode-neckor conductor, the protective cylinders which, according to the specification N.O. 170,505V almost cover over the faces of the insulator towards the vacuum, as well asfother parts, protective tubes, caps andthe like, which exert an influence on the field-disl tribution inthe neighbourhood of the insula* tor, are clamped by asuitable mount coaxially tota centralaxis of the glass-metal assembly and then held in this position by Welding or soldering kThe line connecting the centers of twospheres which can be described in the two metaltubes near their fused edges may be taken, for example, as the middlelongitudinal axis of the glass-metal assembly. The welding or soldering can be done electrically. with the arc or asspot-welding or with a lflame.

One embodiment of the invention isdiagrammatically illustrated by way of'example in the accompanying drawing, wherein :-v v Figure/1 is avertical section showing one form ofleading-infdevice according to the in"- vention, and i Figurek 2 is a horizontalsection taken on the line II-II in Figure 1.

Like reference characters designate like parts in both views. v v

Referring toy the drawingg'W denotes the wall of the container or evacuated vessel, S the conductor, and G is the glass insulator Y fused with the metal tubes R1 and R2 and together constituting a glass-metal assembly referred to above. B1 and B2 are metal cylinders which establish the desired potential distribution at the inner surface of the glass insulator G. The cylinders B1 and B2 are centered relatively to the ytubes, R1 and R2 by annular bosses U of triangular section.- They Y are held rigidly in their yposition by lugs D whichare welded both tothe tubes R1, R2 i 4 and to the cylinders B1, B2. vEven if the tubes the glass tube adjoining the vacuum, said' R1, R2 are not Acoaxial it is possible to `weld v the connecting or spacing members D in position in suchamanner that the Vcylinders B1, B2 are arranged coaxial with theline joining the centers of the bosses U.

" It is to be understood that various modif fications may be madein the details of construction described above without departing from the scope of the invention as defined in the claims. In this connection it will be'quite obvious that the cylinders B1, B2 lmay be rigidlyy and accurately held in position either by welding or soldering, and in the following claims it will be understood that-the expression fused electrically conductivev connection as referring to the manner in which the cylinders B1, B2 are connected with the parts associated therewith is intended to cover either welding or soldering.

I claim l. In a vacuum discharge vessel of metal containing a rarefied Huid, the combination of a leading-in conductor, an insulator seal- Y ing said leadingein conductor in said vessel and conductingl parts covering that portion of the surface of saidinsulator adjoining the vacuum, said conducting parts being slightly spaced from the insulator, one conducting.,

part being electrically connected ,with saidr leading-in conductor, the other conducting part being electrically connected' with said vessel, theseconducting parts being separated bya narrow gap in which the drop infpo- `tential Ibetween said Vessel and said leading'T in conductor is concentrated, said gap being Y locatedvfrom the points of contact of said in- Y sulator and the'conducting parts in the vacuum at a distance forming a multiple'of its width, and fused electrically conductive connections holding said conducting parts in position.

2. In a vacuum dischargevessel o-fmetal`V containing a rarefedV fluid, the combination of a leading-in conductor, two metallic tubes Y connected respectively with the leading-in conductor and the vessel, a glass tube fused coaXially` with the metaltubes,fconducting i i parts covering that portion of the surface of 

